Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a535f0fb8f5cad…

MALICIOUS

PDF

81.9 KB Created: 2021-03-22 13:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5cb0c240ff9d36223cbf47f14a35c806 SHA-1: e89d87daa4d71f530bcd8e83095682bc20c7cb18 SHA-256: 18a535f0fb8f5cadf2bdc483ecb8fe085e744a95a9e391e3076c9b056dfafc55
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including suspicious and invisible links pointing to external domains. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojanized PDF. While no scripts were extracted, the embedded URLs and link farm heuristics point towards a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=occupational+health+psychology+average+salary PDF link annotation
    • http://lyudi23.ru/suwojaxekort70j6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_60312d358a650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5fc855e81d32e.pdfIn PDF document text
    • http://sokuzise.iblogger.org/86778318675.pdfIn PDF document text
    • http://1xbet-registrat.site/msi_gt_710_driver011ft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fdb90976a815.pdfIn PDF document text
    • http://lifeeuro.info/kagutgmy33.pdfIn PDF document text
    • http://talezoruvaje.iblogger.org/landscape_concept_design_report.pdfIn PDF document text
    • http://baltika-trans.com/662587453681uoom.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/UI0F7he/mzansi_hip_hop_music_videos_download.pdfIn PDF document text
    • http://testertumentum.space/financial_algebra_workbook_answersxq4yl.pdfIn PDF document text
    • http://dontbeshy.xyz/where_can_i_donate_used_toys_in_memphistllgj.pdfIn PDF document text
    • http://itasda.online/fagukebitegazorixamudufekcx7my.pdfIn PDF document text
    • http://rukozhop-guide.com/eisenhorn_omnibus_-_dan_abnettk148e.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/hijcvEb/nosetazikoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_60451228a1ead.pdfIn PDF document text
    • http://loginwithfb.site/33368944978pmw9o.pdfIn PDF document text
    • https://cdn.sqhk.co/zowajomi/cjageii/bakilunofovixila.pdfIn PDF document text
    • http://evromotors.net/govejuv9qmj2.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/hiapgij/38202376814.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/e4VdfVZ/download_game_dumb_ways_to_die_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwikomoxure.epizy.com/dogapegan.pdfIn PDF document text
    • http://wiwifiladovov.epizy.com/63042723334.pdfIn PDF document text
    • http://jokiperone.epizy.com/bowflex_watch_battery.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 5384 bytes
SHA-256: 0a3ba10ea9e60a0bf4dd34b54e028a91672eec06c811e964a647dfc8efe6e8ff
font_01_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 10700 bytes
SHA-256: 7e90a26ddcada42782d74aeba0897eafa9a87587b29dbb144d6e668432dbd508

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